Id=3D1mA @ Vgs=3D1.3V (typical). That's plenty. There are certainly others, but Fairchild's search function doesn't work for me.
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The knob could drive a screw, compressing a leaf spring contact onto the cell. Or, use a slide mechanism, if you prefer. Viola.
-- Cheers, James Arthur
You can get VERY tiny slide switches from many sources. Then you install the switch in the spot on top of the caliper with the contact pad. This way you just switch the battery in/out of circuit. They last longer that way.
D.C. ratings are really important here. There are really tiny switches available as you say but few will tolerate many activations that include a current spike measuring at multiples of their D.C. capability.
--Winston
(...)
I see the interposer flex PCB as a 'T'- shape in plan view. The horizontal arm goes between the caliper's '+' contact and wraps around the body of the cell. The vertical arm is bent
90 and can be enlarged to provide adequate contact for the elastomer switch element.I'd call for 2 oz. copper with heavy tin plating so that the part would keep it's 'bend' and not tear under torque.
Alternative embodiments including one in which the power knob houses an external cell are included by implication.
The cover would be slid in place without the knob and then the knob would be screwed in; it'd be removable for cleaning.
A ratcheting torque-limiting clutch inside the knob is left as an exercise.... :)
--Winston
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